Molding machinery.



No. 718,829. PATENTED JAN. 20, 1903.

W. W. DOOLITTLE. MOLDING MACHINERY.

APPLICATION FILED DEC. 7, 1900.

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No. 718,829. PATENTED JAN. 20, 1903. ,WJW. DOOLITTLE.

MOLDING MACHINERY.

APPLICATION FILED DEG. 7, 1900.

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PATENTBD JAN. 20, 1903'.

W. DOOLITTLE. MOLDING MACHINERY.

APPLICATION FILED DEG. Z, 1900.

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WILLIAM W. DOOLI'ITLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO CRANE COMPANY,OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MOLDING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 718,829, dated January20, 1903.

Application filed December '7, 1900. Serial No. 39.108. (No model.)

To all whom, it may concern.-

Be it known that I, WILLIAM W. DooLIT- TLE, a citizen of the UnitedStates, residing in Chicago, Cook county, Illinois, have inventedcertain new and useful Improvements in Molding Machinery, of which thefollowing, taken in connection with the accompanying drawings, is aspecification.

The first of the objects of my invention is the provision of amolding-machine in which the pattern can be conveniently and efficientlyvibrated or agitated, preferably by the use of automatic mechanism atthe moment that the flask is lifted therefrom, in order to facilitatethe separation of the pattern and sand and insure the formation of aperfect mold.

Another object of my invention is the construction of a molding-machinein which the pattern shall be so mounted within an aperturedmold-support as to permit the same to be agitated or vibrated tofacilitate the separation of the pattern from the sand, the said partsbeing constructed in such manner that while the pattern shall be movablewith reference to the apertured mold-support and provided with suitablemeans for agitating or vibrating the same it shall at the same time beprovided with devices to limit the extent of such vibration or agitationwithout permitting undue wear between the pattern and the aperturedmold-support.

In carrying out my invention I preferably construct the pattern andapertu red moldsupport movable the one within the other, to an amountsufficient to permit of the agitation above referred to, but at the sametime not movable in the way in which the pattern is usually movable withreference to an aper-. tured mold-support-that is, capable of beingwithdrawn or of having the stripping-plate elevated above the pattern,so as to separate the mold from the pattern. The reason that I preferthe construction which I have shown herein is that I have foundconsiderable wear of the pattern to result from the movement of the samewithin a stripping-plate of the usual type, this wear, when it becomesappreciable, permitting the sand to enter between the pattern andstripping-plate and interfering with the relative movement between thetwo and the proper operation of the machine.

Another object of myinvention is the combination, with a movable platen,of a novel means for counterbalancing said platen, comprising,primarily, an arm preferably pivoted at a point adjacent to theplaten-frame and provided with a counterbalanced weight or equivalentdevice, the efiective force of which by the construction employed by mevaries substantially just in the proportion that the effectiveresistance to be overcome in moving the platen varies.

The above, as well as such other objects as may hereinafter appear, Iobtain by means of a construction which I have illustrated in preferredform in the accompanying drawings, in which" Figure l is a-sideelevation showing a molding-machine embodying my invention. Fig.

2 is a vertical section taken on the line 2 of Fig. 1 of the same,showing some of the parts in elevation. Fig. 3 is a plan view of thepattern and apertured mold-support, taken on line 3 of Fig. 1. Fig. atis a plan section taken on a line 4 4 of Fig. 2. Fig. 5 is a sectionalelevation taken on the line 5 of Fig. 2 of a part of the machinedesigned to show the relation between the pattern-plate and theapertured mold-support. Fig. 6 shows the same sectional-elevation as isshown in Fig. 5, but with the parts in different relative positions.Fig. 7 is a sectional view taken on the line 7 of Fig. 2, showing aportion of the machine with the means for agitating or vibrating thepattern shown in elevation. Fig. 8 illustrates a detail taken on theline 8 of Fig. 3 of the mechanism relating to the apertured mold-supportand pattern-plate. Fig. 9 illustrates the connection between thepattern-plate and the upwardly-projecting brackets that form a portionof the frame'of the machine, the view taken on the line 9 of Fig. 4.Fig. 10 is a sectional view taken on a vertical plane on the line 10 ofFig. 1, showing the internal construction of the automatic rappingdevice or pneumatic agitator which I prefer to employ in connection withmyimprovements.

In constructing a machine in accordance with my invention I provide,first, a frame consisting of a base part 11 and the upright standards12, together with a fixed piston 13, with its rod 14, about which is amovable cylinder 15, which may be of any preferred construction. Thatwhich I have illustrated admits the fluid-pressure for actuating thecompressing-cylinder through a passage 16 within the piston, and thepressure is arranged to be controlled by means of any suitable valvemechanism, many types of which are well known in this art. Extendingupwardly from the top plate 17 of this cylinder are the supports 18,upon the upper ends of which rests an apertured mold-support 19,securely attached to the supports 18 by means of the bolts 20. Withinthe apertured mold-support is arranged a pattern 21, capable of a slightdegree of lateral, or, more accurately, agitative, or rapping motionrelative to the apertured moldsupport and supported by a pattern-plate22 below the apertured mold-support, the pattern projecting upwardlythrough the latter in,a manner somewhat similar to the arrangement ofthe usual form of stripping-plate, but preferably constructed withoutany capacity for vertical movement relative to each other. Thepattern-plate 22 is supported upon upwardly-projecting arms 23 (see Fig.9) and held in proper relative position by means of screw-bolts 24, theopening 25 through which such screw-bolt projects being of somewhatlarger diameter than the exterior diameter of the bolt in order topermit a slight agitation or vibratory movement of the pattern-platerelative to the support 23.

Beneath the pattern-plate 22 is arranged a flask lifting frame 26,provided with upwardly-projecting adjustable bolts 27, extending throughthe apertured mold-support, so as to raise the flask, as shown in Fig.6, after the mold has been formed. The actuating means for thisflask-lifting frame may be of any preferred construction; but I haveshown a well-known arrangement comprising the rocking lever28, therocker-shaft 29, and the spring hand-lever 30.

The apertured mold-support is provided with four downwardly-projectingpins 31, (see Fig. 8,) arranged to pass through openings 32 in thepattern-plate, which are of slightlylarger diameter than the exteriordiameter of the pins, but still sufficiently small to effectively limitthe extent of the vibratory movement of the pattern-plate relative tothe apertured mold-support. The extent of play provided between thepatterns and the openings in the apertured mold-support through whichthe patterns project will in itself of course limit the amount ofvibratory movement that maybe imparted to the patterns andpattern-plate; but I prefer to save the patterns from all wear possible,and to this end introduce the pins 31, just referred to.

To the lower side of the pattern-plate 22 (see Fig. 7) I attach anautomatic rapping device 23, preferably constructed to be opersuitablevalve mechanism, many forms of' which are well known in the art.

The automatic mechanism shown in Fig. 10 is of the usual valveless type.The piston, which I have marked 43, is provided with an internal port44, which connects with a transverse port or a series of transverseports 45, through which air introduced by the inletpipe 33 reaches theright-hand end of the piston to force the same against the left-hand endof the cylinder when the ports 45 pass the partition 47, at which timethe inlet from the supply-pipe 33 is cut OE and the outlet through thedotted port 46 is opened to communication from the right-hand end of thepiston-chamber through the ports 45, which allow the pressure thatforced the piston over to exhaust, after which live-air pressure in thespace between the large head of the 'piston and the smaller end servesto return the piston to the position shown in the drawings.

Upon the uprights 12 I have pivoted arms 34, constructed to engage therods or side pieces 35, which carry the platen 36 from a pivoted center37 at the base of the machine. The arms 34 are provided with weights orweighted ends 38, so arranged with relation to the arms that when theplaten is in position over the flask the weights will not exert anyforce against the platen; but the rod 35 will bear against the stop 39,so as to check the forward movement of the platen exactly in the properplace. As the platen swings backward, as shown in Fig. 1, the arms 34turn so as to raise the weight or weighted ends 38, and the effectiveforce of the weights increases, as will be clearly evident from anexamination of the drawings, the farther back the platen is moved, thuscompensating for the increased force necessary to return the platen, dueto its farther backward movement.

The term apertured mold-support which I have hereinabove used I intendto apply to the plate which supports the sand in the mold around thepatterns, and I do not thereby intend to indicate what is known as anordinary stripping-plate, or, as it is sometimes called in the art, asilhouette-plate that is, a plate which has a vertical or reciprocativemovement relative to the pattern, whereby in forming the mold the platesupports the sand during the act of pulling the pattern from the mold.In my apparatus, as is clear from the drawings, there is no provisionmade for any relative reciprocative movement between the sand-supportingor apertured mold support, asI have termed it, and the pattern, but onlya capability of vibratory or rapping movement between the two, which ispreferably and primarily on a horizontal planethat is, which takes placelaterally with reference to the vertical axis of the mold.

The operation of my invention is follows: The flask having been put inposition, as shown in Fig. 1, and filled with sand, the platen isbrought over the flask and the mold compressed in the usual manner.After this operation, the exhaust of the fluid-pressure in the cylinderpermits the latter to descend to the position shown in Fig. 2. Theplaten is now moved out of the Way to theposition shown in Fig. 1, airis admitted to the automatic rapping device, and while the same isagitating the pattern by the rapid vibration caused by its piston thelever 30 is'sprung out of the notch with which it engages and lifted tothe uppernotch 40, (see'Fig. 1,) which Will raise the flask and separatethe mold from the pattern, bringing the parts to the position shown inFig. 6, the agitation or vibration of the pattern caused by theautomatic rapping device insuring a perfect separation between the moldand the pattern.

Having thus described myinvention, what I claim as new, and desire tosecure by Let ters Patent, is-

1. A molding-machine, comprising a plate for supporting the sand aroundthe patterns having an opening corresponding to the pattern, a patterncapable of trembling or rapping movement within said opening, andmechanism for rapping said patteru,Wherebyto loosen the same from themold, substantially as described.

2. A molding-machine having a sand-supporting plate containing anopening corresponding to a pattern, a pattern-plate, patterns mountedupon said pattern-plate, and supported thereby by means of projectionsextending through said first-mentioned plate, said patterns constructedso as to be capable of trembling or rapping movement relative to saidplate, mechanism for agitating said pattern-plate and pattern, and meansfor separating the mold from the pattern during the operation of saidagitating mechanism, substantially as described.

3. Amolding-machinecomprisingastationary apertured supporting-plate forthe sand, a pattern capable of vibrating movement Within said aperturedsand-support, mechanism for agitating said pattern, and stop devices forlimiting the extent of the vibratory motion between the pattern and thesand-support, substantially as described.

4. A molding-machine having an apertured san d-support,a pattern-plate,patterns mounted upon said patternplate and supported thereon byprojections extending through the apertured sand-support, said patternsconstructed so as to be capable of trembling or vibratory movementrelatively to said sandsupport, mechanism for agitating saidpattern-plate and patterns, means for separating the mold from thepattern during the operation of the said agitating mechanism, and stopdevices for limiting the vibratory movement of said pattern -platerelative to said sand-support, substantially as described.

5. A molding-machine comprising an apertured mold support, a patterncapable of trembling or rapping movement within said aperturedmold-support, mechanism for agitating said pattern, and pins forlimiting the extent of the vibratory motion between the pattern and theapertured mold-support, substantially as described.

6. A molding-machine comprising a sandsupporting plate having an openingcorresponding to the pattern, a pattern capable of trembling or rappingmovement within said opening, mechanism for rapping said pattern, andmeans for separating said pattern and mold, so arranged that the patternand the mold may be separated simultaneously with the operation of saidrapping mechanism, substantially as described.

WILLIAM W. DOOLITTLE.

Witnesses PAUL SYNNESTVEDT, PAUL CARPENTER.

